I've worked with a few live edge slabs in the past, but the one I have now is the first one with a sizable crack. I don't like the look of butterfly keys, and I don't believe that this crack needs much reinforcement, but I was going to fill it with West epoxy just in case (and as a way to finally try using it).
The thing that has surprised me in the videos I've seen is that all of them use a very dark tint, many going with straight black. It creates a very striking aesthetic effect, but I don't think I want to pull the visual focus away from the wood like that. I was considering using the epoxy without a tint so that the reinforcement is relatively invisible, and went with the 207 hardener for this purpose.
However, I have not been able to find a single example of clear epoxy being used. I've done some googling but in addition to not seeing any examples, I also cannot find any discussion of why tinting is so common. Since it is done so rarely I assume there must be a reason, and don't want to ruin my slab due to my inexperience, so:
Why is clear epoxy not used? What considerations should go into a decision about whether, and how, to tint?